/**
 * 
 * Copyright (C) 2011 Cody Stoutenburg . All rights reserved.
 *
 *       This program is free software; you can redistribute it and/or
 *       modify it under the terms of the GNU Lesser General Public License
 *       as published by the Free Software Foundation; either version 2.1
 *       of the License, or (at your option) any later version.
 *
 *       This program is distributed in the hope that it will be useful,
 *       but WITHOUT ANY WARRANTY; without even the implied warranty of
 *       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *       GNU Lesser General Public License for more details.
 *
 *       You should have received a copy of the GNU Lesser General Public License
 *       along with this program; if not, write to the Free Software
 *       Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. 
 * 
 */
package ca.usherbrooke.behaviours.controller.request;

import jade.core.AID;
import jade.lang.acl.ACLMessage;
import jade.lang.acl.MessageTemplate;
import jade.lang.acl.UnreadableException;

import java.io.IOException;

import ca.usherbrooke.agent.controller.EntityUpdaterAgent;
import ca.usherbrooke.agent.message.RequestMessageObjectEntitySubscription;
import ca.usherbrooke.behaviours.BasicCyclicBehaviour;
import ca.usherbrooke.behaviours.world.SubscriptionEntityModel;
import ca.usherbrooke.model.world.IWorldModel;
import ca.usherbrooke.utils.ExceptionTool;

/**
 * @author Cody Stoutenburg
 * 
 */
public class SubscriberEntity extends BasicCyclicBehaviour<EntityUpdaterAgent> {
	private static final long serialVersionUID = 1L;

	private static final MessageTemplate TEMPLATE_PERFORMATIVE = MessageTemplate
			.MatchPerformative(SubscriptionEntityModel.SUBSCRIBER_ENTITY_PERFORMATIVE);
	private static final MessageTemplate TEMPLATE_PROTOCOL = MessageTemplate
			.MatchProtocol(SubscriptionEntityModel.SUBSCRIPTION_ENTITY_PROTOCOL);

	private static final MessageTemplate TEMPLATE_RECEIVE_MESSAGE = MessageTemplate
			.and(TEMPLATE_PERFORMATIVE, TEMPLATE_PROTOCOL);

	/**
	 * @param a
	 */
	public SubscriberEntity(EntityUpdaterAgent a, AID receiver, Long guid) {
		super(a);

		ACLMessage msg = new ACLMessage(
				SubscriptionEntityModel.SUBSCRIPTION_ENTITY_PERFORMATIVE);
		msg.setProtocol(SubscriptionEntityModel.SUBSCRIPTION_ENTITY_PROTOCOL);
		msg.addReceiver(receiver);

		RequestMessageObjectEntitySubscription<Long> request = new RequestMessageObjectEntitySubscription<Long>(
				RequestMessageObjectEntitySubscription.REGISTER_ON_ENTITY, guid);
		try {
			msg.setContentObject(request);
		} catch (IOException ex) {
			ExceptionTool.showError(ex);
		}

		// send register request
		this.getAgent().send(msg);

	}

	// private static Long totalTime = 0L;
	// private static Long nbSerialize = 0L;

	@Override
	public void action() {
		ACLMessage msg = this.getAgent().receive(TEMPLATE_RECEIVE_MESSAGE);
		ACLMessage previous = null;
		while (msg != null) {
			previous = msg;
			msg = this.getAgent().receive(TEMPLATE_RECEIVE_MESSAGE);
		}
		if (previous != null) {
			try {
				IWorldModel content = (IWorldModel) previous.getContentObject();
				this.getAgent().setWorld(content);
			} catch (UnreadableException ex) {
				ExceptionTool.showError(ex);
			}
		}

		block();
	}

	public void unsubscribe() {

	}
}
